Frost dates for 75457Mount Vernon, TX
The average last spring frost in Mount Vernon is March 15 and the average first fall frost is November 16, giving a typical growing season of about 245 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 15
- Average first fall frost
- Nov 16
- Growing season
- 245 days
Safer after Apr 6 (1-in-10 risk)
Possible by Oct 31 (1-in-10 risk)
First frost typically in 20 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Mar 8 · Mar 31 · Apr 19 | Oct 21 · Nov 4 · Nov 22 | 220 days | 100% |
| Frost / freeze (32°F) | Feb 23 · Mar 15 · Apr 6 | Oct 31 · Nov 16 · Dec 4 | 245 days | 100% |
| Hard freeze (28°F) | Feb 4 · Mar 2 · Mar 25 | Nov 8 · Dec 1 · Dec 21 | 273 days | 100% |
Planting calendar for Mount Vernon
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Feb 12 – Apr 20 |
| Tomatoes | Transplant outdoors | Mar 31 – Jul 27 |
| Peppers | Start seeds indoors | Feb 12 – Mar 15 |
| Peppers | Transplant outdoors | Apr 14 – May 15 |
| Eggplant | Start seeds indoors | Mar 1 – Mar 30 |
| Eggplant | Transplant outdoors | Apr 14 – May 15 |
| Cucumbers | Sow outdoors | Apr 14 – Aug 6 |
| Summer squash | Sow outdoors | Mar 31 – May 15 |
| Winter squash & pumpkins | Sow outdoors | Apr 14 – May 15 |
| Snap beans | Sow outdoors | Mar 31 – Aug 29 |
| Sweet corn | Sow outdoors | Mar 31 – Jul 27 |
| Watermelon & cantaloupe | Sow outdoors | Apr 14 – May 15 |
| Okra | Sow outdoors | Apr 7 – Apr 30 |
| Peas | Sow outdoors (spring) | Feb 12 – Mar 30 |
| Potatoes | Plant outdoors (spring) | Feb 12 – Apr 14 |
| Onions | Start seeds indoors (spring) | Jan 1 – Jan 28 |
| Onions | Transplant outdoors (spring) | Mar 1 – Mar 30 |
| Broccoli | Start seeds indoors (spring) | Jan 25 – Feb 28 |
| Broccoli | Transplant outdoors (spring) | Mar 1 – Mar 30 |
| Broccoli | Start seeds indoors (fall) | Jul 17 – Jul 27 |
| Broccoli | Transplant outdoors (fall) | Aug 16 – Aug 27 |
| Cabbage | Start seeds indoors (spring) | Jan 15 – Feb 12 |
| Cabbage | Transplant outdoors (spring) | Feb 12 – Mar 15 |
| Cabbage | Start seeds indoors (fall) | Jul 7 – Aug 6 |
| Cabbage | Transplant outdoors (fall) | Aug 6 – Sep 6 |
| Leaf lettuce | Sow outdoors (spring) | Feb 12 – Apr 30 |
| Leaf lettuce | Sow outdoors (fall) | Aug 6 – Sep 22 |
| Spinach | Sow outdoors (spring) | Feb 5 – Mar 21 |
| Spinach | Sow outdoors (fall) | Aug 23 – Sep 27 |
| Radishes | Sow outdoors (spring) | Feb 12 – Apr 4 |
| Radishes | Sow outdoors (fall) | Aug 6 – Oct 7 |
| Kale | Sow outdoors (spring) | Mar 1 – Mar 21 |
| Kale | Sow outdoors (fall) | Jul 30 – Sep 6 |
| Carrots | Sow outdoors (spring) | Mar 15 – Apr 30 |
| Carrots | Sow outdoors (fall) | Jul 7 – Aug 22 |
| Garlic | Plant outdoors (fall) | Nov 6 – Dec 7 |
Where these dates come from
ZIP code 75457 is matched to the NOAA station Mt Vernon, TX, 3 km away, at 447 ft elevation (52 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mt Vernon, TX (used) | 447 ft | Mar 15 | Nov 16 |
| Mt Pleasant, TX | 425 ft | Mar 24 | Nov 7 |
| Sulphur Springs, TX | 495 ft | Mar 15 | Nov 14 |
| Cooper Dam, TX | 463 ft | Mar 18 | Nov 13 |
Frost dates near Mount Vernon
- Winfield, TX 75493 · last Mar 15, first Nov 16
- Saltillo, TX 75478 · last Mar 15, first Nov 16
- Scroggins, TX 75480 · last Mar 15, first Nov 16
- Pickton, TX 75471 · last Mar 15, first Nov 16
- Mount Pleasant, TX 75455 · last Mar 24, first Nov 7
- Sulphur Bluff, TX 75481 · last Mar 15, first Nov 16
- Dike, TX 75437 · last Mar 15, first Nov 16
- Leesburg, TX 75451 · last Mar 24, first Nov 7
Frequently asked questions
- When is the last frost in Mount Vernon, TX?
- For ZIP code 75457, the average last spring frost (32°F) is March 15, based on NOAA 1991-2020 climate normals for the Mt Vernon, TX weather station. There is a 1-in-10 chance of a frost after April 6.
- When is the first frost in Mount Vernon, TX?
- The average first fall frost (32°F) is November 16. There is a 1-in-10 chance of frost by October 31, so tender plants are at risk from that point on.
- How long is the growing season in 75457?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 245 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.